Abstract
Abstract The polymerization of acrylic acid (AA) in a dilute aqueous solution in the presence of polyvinylpyrrolidone (PVP) has been studied kinetically, with the extent of polymerization followed by a bromometric titration method. The rate of the polymerization changed characteristically with the amount of PVP in the solution and went through a maximum at a certain initial mole ratio of PVP and AA, [PVP]0/[AA]0, under a constant [AA]0 value. The mole ratio which gave the maximum rate was almost proportional to the reciprocal of [AA]0. In the course of the polymerization, a polymer complex consisting of PVP and polymerized AA was precipitated. Its composition, (PAA)c/(PVP)c, has been found to be different as the polymerization conditions are varied. Hardly no comparable data between the bromometric method and a turbidimetric method used to measure the rate were obtained. The influence of PVP on the polymerization was assumed to be caused by the local concentration of AA in the vicinity of PVP. A mechanism based on the effect of the local concentration, the “polymer atmosphere binding mechanism,” has been found to explain the experimental results well.
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